Occasionally, a knee replacement might not work correctly. Various factors can contribute to this, and common reasons include the following: loose implants, infection, joint instability, bone fracture, stiffness, knee cap complications, and allergic reactions. To address these concerns, a follow-up surgery known as a revision knee arthroplasty may be necessary. This involves replacing one or more implants from the initial knee replacement. In more complex cases, particularly with infections, multiple revision surgeries may be needed for a comprehensive solution. New technologies such as custom instruments are improving the accuracy of these surgeries. Typically, revision surgery requires a brief hospital stay to ensure proper recovery and address any challenges related to the initial knee replacement.